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Sidjis (which can also be spelled sijis if you ain't about that D) is a slangy way of saying the word 'insidious' without attracting unwanted attention from horror movie fanatics.
WRONG-
Guy: The insidious infiltration of politics into casual media is becoming increasingly problematic.
Other Guy: OMG Insidious?! I love that movie!

RIGHT-
Guy: The sidjis infiltration of politics into casual media is becoming increasingly problematic.
Other Guy: I wholeheartedly concur, my friend.
by TheSlanguist June 30, 2018
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